Zend certified PHP/Magento developer

Widget Page not loading and receiving errors in developer mode

I’m getting the below errors, tried to following..

Using magento 2, php 7.2

Exception #0 (Exception): Warning: MagentoFrameworkViewElementHtmlCalendar::_toHtml(): Cannot load resource element 'fields' in /home/sites/10a/0/0f56ee79d9/public_html/staging/vendor/magento/framework/View/Element/Html/Calendar.php on line 112
Exception #0 (Exception): Warning: MagentoFrameworkViewElementHtmlCalendar::_toHtml(): Cannot load resource element 'fields' in /home/sites/10a/0/0f56ee79d9/public_html/staging/vendor/magento/framework/View/Element/Html/Calendar.php on line 112
#1 MagentoFrameworkViewElementHtmlCalendar->_toHtml() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1094]
#2 MagentoFrameworkViewElementAbstractBlock->MagentoFrameworkViewElement{closure}() called at [vendor/magento/framework/View/Element/AbstractBlock.php:1098]
#3 MagentoFrameworkViewElementAbstractBlock->_loadCache() called at [vendor/magento/framework/View/Element/AbstractBlock.php:671]
#4 MagentoFrameworkViewElementAbstractBlock->toHtml() called at [vendor/magento/framework/View/Layout.php:557]
#5 MagentoFrameworkViewLayout->_renderBlock('head.calendar') called at [vendor/magento/framework/View/Layout.php:533]
#6 MagentoFrameworkViewLayout->renderNonCachedElement('head.calendar') called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:206]
#7 MagentoFrameworkViewLayoutInterceptor->renderNonCachedElement('head.calendar') called at [vendor/magento/framework/View/Layout.php:488]
#8 MagentoFrameworkViewLayout->renderElement('head.calendar', false) called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:193]
#9 MagentoFrameworkViewLayoutInterceptor->renderElement('head.calendar', false) called at [vendor/magento/framework/View/Layout.php:585]
#10 MagentoFrameworkViewLayout->_renderContainer('after.body.start', false) called at [vendor/magento/framework/View/Layout.php:535]
#11 MagentoFrameworkViewLayout->renderNonCachedElement('after.body.start') called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:206]
#12 MagentoFrameworkViewLayoutInterceptor->renderNonCachedElement('after.body.start') called at [vendor/magento/framework/View/Layout.php:488]
#13 MagentoFrameworkViewLayout->renderElement('after.body.start', false) called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:193]
#14 MagentoFrameworkViewLayoutInterceptor->renderElement('after.body.start', false) called at [vendor/magento/framework/View/Layout.php:585]
#15 MagentoFrameworkViewLayout->_renderContainer('backend.page', false) called at [vendor/magento/framework/View/Layout.php:535]
#16 MagentoFrameworkViewLayout->renderNonCachedElement('backend.page') called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:206]
#17 MagentoFrameworkViewLayoutInterceptor->renderNonCachedElement('backend.page') called at [vendor/magento/framework/View/Layout.php:488]
#18 MagentoFrameworkViewLayout->renderElement('backend.page', false) called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:193]
#19 MagentoFrameworkViewLayoutInterceptor->renderElement('backend.page', false) called at [vendor/magento/framework/View/Layout.php:585]
#20 MagentoFrameworkViewLayout->_renderContainer('root', false) called at [vendor/magento/framework/View/Layout.php:535]
#21 MagentoFrameworkViewLayout->renderNonCachedElement('root') called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:206]
#22 MagentoFrameworkViewLayoutInterceptor->renderNonCachedElement('root') called at [vendor/magento/framework/View/Layout.php:488]
#23 MagentoFrameworkViewLayout->renderElement('root', true) called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:193]
#24 MagentoFrameworkViewLayoutInterceptor->renderElement('root') called at [vendor/magento/framework/View/Layout.php:954]
#25 MagentoFrameworkViewLayout->getOutput() called at [generated/code/Magento/Framework/View/Layout/Interceptor.php:492]
#26 MagentoFrameworkViewLayoutInterceptor->getOutput() called at [vendor/magento/framework/View/Result/Page.php:258]
#27 MagentoFrameworkViewResultPage->render(&MagentoFrameworkAppResponseHttpInterceptor#000000001017c3ae000000000ff7c34a#) called at [vendor/magento/framework/View/Result/Layout.php:171]
#28 MagentoFrameworkViewResultLayout->renderResult(&MagentoFrameworkAppResponseHttpInterceptor#000000001017c3ae000000000ff7c34a#) called at [generated/code/Magento/Backend/Model/View/Result/Page/Interceptor.php:193]
#29 MagentoBackendModelViewResultPageInterceptor->renderResult(&MagentoFrameworkAppResponseHttpInterceptor#000000001017c3ae000000000ff7c34a#) called at [vendor/magento/framework/App/View.php:221]
#30 MagentoFrameworkAppView->renderLayout() called at [vendor/magento/module-widget/Controller/Adminhtml/Widget/Instance/Index.php:22]
#31 MagentoWidgetControllerAdminhtmlWidgetInstanceIndex->execute() called at [generated/code/Magento/Widget/Controller/Adminhtml/Widget/Instance/Index/Interceptor.php:24]
#32 MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor->execute() called at [vendor/magento/framework/App/Action/Action.php:108]
#33 MagentoFrameworkAppActionAction->dispatch(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/module-backend/App/AbstractAction.php:231]
#34 MagentoBackendAppAbstractAction->dispatch(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/framework/Interception/Interceptor.php:58]
#35 MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor->___callParent('dispatch', array(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#)) called at [vendor/magento/framework/Interception/Interceptor.php:138]
#36 MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor->MagentoFrameworkInterception{closure}(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/module-backend/App/Action/Plugin/Authentication.php:143]
#37 MagentoBackendAppActionPluginAuthentication->aroundDispatch(&MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor#000000001017c0f7000000000ff7c34a#, &Closure#000000001017c0f6000000000ff7c34a#, &MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/framework/Interception/Interceptor.php:135]
#38 MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor->MagentoFrameworkInterception{closure}(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/framework/Interception/Interceptor.php:153]
#39 MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor->___callPlugins('dispatch', array(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#), NULL) called at [generated/code/Magento/Widget/Controller/Adminhtml/Widget/Instance/Index/Interceptor.php:39]
#40 MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor->dispatch(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/framework/App/FrontController.php:159]
#41 MagentoFrameworkAppFrontController->processRequest(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#, &MagentoWidgetControllerAdminhtmlWidgetInstanceIndexInterceptor#000000001017c0f7000000000ff7c34a#) called at [vendor/magento/framework/App/FrontController.php:99]
#42 MagentoFrameworkAppFrontController->dispatch(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/framework/Interception/Interceptor.php:58]
#43 MagentoFrameworkAppFrontControllerInterceptor->___callParent('dispatch', array(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#)) called at [vendor/magento/framework/Interception/Interceptor.php:138]
#44 MagentoFrameworkAppFrontControllerInterceptor->MagentoFrameworkInterception{closure}(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/framework/Interception/Interceptor.php:153]
#45 MagentoFrameworkAppFrontControllerInterceptor->___callPlugins('dispatch', array(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#), array(array('default_store_se...', 'page_cache_from_...', 'storeCookieValid...', 'install', 'configHash'))) called at [generated/code/Magento/Framework/App/FrontController/Interceptor.php:26]
#46 MagentoFrameworkAppFrontControllerInterceptor->dispatch(&MagentoFrameworkAppRequestHttp#000000001017c3d5000000000ff7c34a#) called at [vendor/magento/framework/App/Http.php:137]
#47 MagentoFrameworkAppHttp->launch() called at [generated/code/Magento/Framework/App/Http/Interceptor.php:24]
#48 MagentoFrameworkAppHttpInterceptor->launch() called at [vendor/magento/framework/App/Bootstrap.php:261]
#49 MagentoFrameworkAppBootstrap->run(&MagentoFrameworkAppHttpInterceptor#000000001017c3a7000000000ff7c34a#) called at [index.php:39]

Tried running the following:

bin/magneto setup:upgrade

bin/magneto setup:di:compile

bin/magneto setup:static-content:deploy

also tried clearing cache and re indexing etc.

any help is appreciated.